OM a threat or just a friend? WAWs got an answer?

[Mr GK]

I can't figure out if my wife's friend is a romantic partner or just a friend. She admitted to me that they once did get physical. That killed me!
We live in separate states and she did not know hardly anyone.
He has been a friend to her and her sister and their several children.
She seems to regret the infidelity, and I do not rub that in her face. But Is he a threat or could a WAW just have a guy friend?
Maybe she is waiting to see if i continue to grow up, and then maybe after a time of proving myself, GAL, and maturing, maybe she would want me back.

What do other WAWs think?